CN211770295U - Device for purifying and recovering hydrogen from hydrogen-containing fuel gas - Google Patents
Device for purifying and recovering hydrogen from hydrogen-containing fuel gas Download PDFInfo
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- CN211770295U CN211770295U CN201922369567.7U CN201922369567U CN211770295U CN 211770295 U CN211770295 U CN 211770295U CN 201922369567 U CN201922369567 U CN 201922369567U CN 211770295 U CN211770295 U CN 211770295U
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Abstract
The utility model belongs to the field of hydrogen extraction, in particular to a device for purifying and recovering hydrogen from hydrogen-containing fuel gas, wherein a refrigeration dryer is connected with a filter in the device, the filter is connected with a membrane separator, the membrane separator is connected with a vacuum pump, the vacuum pump is connected with a hydrogen-rich gas compressor, one end of a pressure regulating valve is arranged between the membrane separator and the vacuum pump, the other end of the pressure regulating valve is arranged between the vacuum pump and the hydrogen-rich gas compressor, and the membrane separator, the vacuum pump and the pressure regulating valve are connected through a backflow pipeline; the hydrogen-rich gas compressor is connected with the pressure swing adsorption hydrogen purification device, the pressure swing adsorption hydrogen purification device is connected with the desorption gas compressor, and the other end of the desorption gas compressor is connected with the cold dryer; the hydrogen product is output by the pressure swing adsorption hydrogen purification device, and the residual fuel gas is output by the membrane separator. The utility model discloses the permeation efficiency of hydrogen on the membrane surface can improve 15% ~ 40%, obviously reduces membrane separation device's energy consumption and running cost, and cooperation pressure swing adsorption purification hydrogen device can obtain 99.9% ~ 99.999% hydrogen product.
Description
Technical Field
The utility model belongs to chemical industry hydrogen draws the field, especially relates to a device of hydrogen is retrieved in purification from hydrogenous fuel gas.
Background
The fuel gas mainly comprises two major types of natural gas fuel and artificial gas fuel in the industry, which are clean energy and high-quality energy and are closely related to the life of people. All gaseous fuels are a mixture of various components, the combustible components being hydrogen, carbon monoxide, methane, hydrogen sulfide and various hydrocarbons. The non-combustible gas mainly comprises carbon dioxide, nitrogen, water vapor and the like. Natural gas includes methane, natural gas, liquefied gas, etc. The processed solid fuel is coke oven gas, water gas, producer gas and the like which are obtained by dry distillation or gasification of solid fuel; petroleum gas obtained from petroleum processing, blast furnace gas generated in the iron-making process, and the like.
Hydrogen is an important resource in novel energy and petrochemical industry, and the prior technology for separating and recovering hydrogen from hydrogen-containing mixed gas and fuel gas mainly comprises a pressure swing adsorption method and a membrane separation method.
In the case of adsorption equilibrium, the lower the temperature, the higher the pressure, and the greater the amount of adsorption. Conversely, the higher the temperature and the lower the pressure, the smaller the amount of adsorption. Therefore, the adsorption separation method of gas usually adopts two circulation processes of temperature swing adsorption or pressure swing adsorption. If the temperature is not changed, the adsorption is carried out under pressure, and the pressure is reduced (vacuum is drawn) or the desorption is carried out under normal pressure, so that the pressure swing adsorption is called. The adsorption separation of the pressure swing adsorption method is to separate the specific gas by utilizing the difference of adsorption and desorption capacity of the adsorbent. The adsorption capacity, adsorption force and adsorption speed of different gases are different with different pressures, under the condition of selective adsorption of adsorbent the easily-adsorbed components in the mixture can be pressurized and adsorbed, and when the adsorption bed is depressurized, these adsorbed components can be desorbed so as to make the adsorbent regenerate. The pressure swing adsorption method has the advantages of high regeneration speed, low energy consumption, simple operation and mature and stable process. The method has the advantages that the hydrogen with high product purity (99.99%) can be obtained, the hydrogen recovery rate is about 85-90%, and the impurity content is low. However, for the hydrogen-containing fuel gas with lower hydrogen content and lower pressure, the pressure swing adsorption device is directly adopted for separation, the pressure swing adsorption load is high, the investment is high and the occupied area is large.
The gas membrane separation technology is a new generation of gas separation technology, and the principle of the technology is that under the driving of pressure, the separation is carried out by means of the adsorption capacity of each component in gas on the surface of a polymer membrane and the difference of dissolution and diffusion in the membrane, namely the difference of permeation rates, and the permeation driving force is the partial pressure difference on two sides of the membrane. The membrane separation technology has the advantages of simple process, large operation flexibility, low cost and the like. However, the purity of the hydrogen recovered by membrane separation is not high, and the feed gas is required to have a relatively high pressure, and is particularly sensitive to the feed gas, especially to the feed gas entrained liquid.
When the pressure of the hydrogen-containing fuel gas is 0.2-1.0 Mpa and the hydrogen content is 20-50%, the hydrogen is purified from the gas, and the technical problems of low membrane separation efficiency, large membrane material consumption, high investment cost and the like exist because the permeation driving force of the hydrogen on the surface of the membrane is small. Or the hydrogen-containing feed gas is subjected to membrane separation in a mode of compressing and pressurizing the hydrogen-containing feed gas under 1.0-3.0 Mpa to obtain hydrogen with high recovery rate, but the technical problems of high cost of a compressor and high pressurizing energy consumption exist.
Light hydrocarbon and hydrogen in the refinery dry gas have high utilization value, but the light hydrocarbon and the hydrogen are usually sent into a gas pipe network to be used as fuel gas, and some of the fuel gas are even put into a torch to be burned, so that the great waste of resources is caused. The refinery dry gas mainly comes from the secondary processing process of crude oil, such as heavy oil catalytic cracking, thermal cracking, delayed coking, etc., wherein the dry gas generated by catalytic cracking (FCC) is large, and generally accounts for 4% -5% of the crude oil processing amount. The main components of the FCC dry gas are hydrogen (accounting for 25-40%) and ethylene (accounting for 10-20%), and the main components of the delayed coking dry gas are methane and ethane.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a device of hydrogen is retrieved in purification from hydrogen-containing fuel gas adopts purification to retrieve hydrogen in membrane and the pressure swing adsorption coupling hydrogen fuel gas, has overcome the restriction that conventional membrane separation method need compress the pressurization and operate under higher pressure and can not obtain high-purity hydrogen under the lower condition of raw materials hydrogen content, can obtain 99.9% ~ 99.999% pure hydrogen or high-purity hydrogen product.
Solve above technical problem the utility model provides a device of hydrogen is retrieved in purification from hydrogen-containing fuel gas, its characterized in that: the utility model provides a device of purification recovery hydrogen in hydrogen-containing fuel gas which characterized in that: the device comprises a refrigeration dryer, a filter, a gas decomposition compressor, a membrane separator, a vacuum pump, a pressure regulating valve, a hydrogen-rich gas compressor, a backflow pipeline and a pressure swing adsorption hydrogen purification device, wherein the refrigeration dryer is connected with the filter; the hydrogen-rich gas compressor is connected with the pressure swing adsorption hydrogen purification device, the pressure swing adsorption hydrogen purification device is connected with the gas decomposition compressor, and the other end of the gas decomposition compressor is connected with the cold dryer; the hydrogen product is output by a pressure swing adsorption hydrogen purification device, and the residual fuel gas is output by a membrane separator; all structures are connected by pipelines.
The membrane separator is provided with a membrane assembly comprising a membrane, the membrane is provided with a retentate side and a permeate side, and the permeate side is connected with a vacuum pump and permeates hydrogen; one end of the residual side is connected with the filter, and the other end is connected with the fuel gas device to output residual fuel gas. The raw material inlet and outlet are connected to form the retentate side, and the permeate side is the other side through which hydrogen gas permeates.
The pressure of the residual side is 0.2-1.0 Mpa.
The pressure of the infiltration side is negative pressure and is-0.04 to-0.09 Mpa.
The pressure of the infiltration side is-0.081 to-0.085 Mpa.
And a heater is arranged between the filter and the cold drying machine, one end of the heater is connected with the filter, and the other end of the heater is connected with the cold drying machine.
The temperature of the heater is 20-80 ℃.
The drying temperature of the drying machine is 2-10 ℃, and the pressure value is 0.2-1.0 Mpa.
The utility model provides a method for purify recovery hydrogen in follow hydrogenous fuel gas, including following step:
(1) hydrogen-containing fuel gas enters a cold dryer to remove hydrocarbon components, water and other liquid substances;
(2) removing trace solid particle impurities in the gas through a filter;
(3) purifying hydrogen in a membrane separator, a vacuum pump, a reflux pipeline and a pressure regulating valve, evacuating hydrogen at the permeation side of the membrane to obtain a crude hydrogen product, and discharging gas at the residual side of the membrane out of the membrane separator to be output as residual fuel gas;
the pressure of the permeation side of the membrane in the membrane separator is reduced and stabilized to a lower pressure, and the residual fuel gas enters a factory fuel gas pipe network to be used as fuel;
(4) the crude hydrogen product in the step (3) enters a hydrogen-rich compressor and a pressure swing adsorption hydrogen purification device for purification again; outputting a part of gas as a hydrogen product; and the hydrogen product obtained by the evacuation system is pressurized and then is further purified by a pressure swing adsorption hydrogen purification device to obtain pure hydrogen or a high-purity hydrogen product.
(5) And (4) passing the other part of the gas in the step (4) through a desorption gas compressor, mixing with the hydrogen-containing fuel gas, and recycling.
When the permeation side of the membrane separation device is evacuated by adopting an evacuation system, hydrogen at the outlet of a partial vacuum system is returned to the permeation side of the membrane device so as to ensure the stable pressure of the permeation side.
The pressure of the hydrogen-containing fuel gas is 0.2 Mpa-1.0 Mpa, and the hydrogen content is 20-40 percent.
And (2) a heating step is also arranged between the step (1) and the step (2), the temperature of the heated gas is 20-80 ℃, and the hydrogen-containing fuel gas of the oil refinery is heated before entering the membrane separation device.
The utility model relates to a device for purifying and recovering hydrogen from hydrogen-containing fuel gas, which is applied to the purification of hydrogen in the fuel gas with pressure of 0.2 Mpa-1.0 Mpa and hydrogen content of 20% -40%.
The device is applied to the refinery dry gas with the pressure of 0.2 Mpa-1.0 Mpa and the hydrogen content of 20% -40%.
The utility model discloses a vacuum system reduces the pressure of membrane separation device hydrogen permeation side, the partial pressure difference of hydrogen in membrane both sides hydrogen has been improved, the permeation driving force of hydrogen on the membrane surface has been improved, compared with the current membrane separation device that does not manage to find time the decompression to membrane separation unit hydrogen permeation side, hydrogen can improve 15% ~ 40% at the osmotic efficiency on membrane surface, can obviously reduce membrane separation device's energy consumption and running cost, adopt the hydrogen-rich permeate gas pressurization back of membrane device as pressure swing adsorption device's raw materials, pressure swing adsorption's operating condition has been optimized, show the investment and the occupation of land that reduce pressure swing adsorption purification hydrogen device. And pressurizing the hydrogen product obtained after evacuation, and further purifying by a pressure swing adsorption device to obtain pure hydrogen or a high-purity hydrogen product. And a desorption gas compressor is additionally connected with the pressure swing adsorption hydrogen purification device, so that the whole device forms a circulating system, the recovery and separation effects are increased, the cost is low, and the operation is simple.
The utility model discloses the permeation efficiency of hydrogen on the membrane surface can improve 15% ~ 40%, obviously reduces membrane separation device's energy consumption and running cost, and cooperation pressure swing adsorption purification hydrogen device can obtain 99.9% ~ 99.999% hydrogen product.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments, wherein the used equipment and instruments are conventional equipment and instruments, and the cold drying machine, the filter, the membrane separator, the vacuum pump, the pressure regulating valve, the heater, the hydrogen-rich compressor, the desorption gas compressor, the pressure swing adsorption hydrogen purification device, etc. are conventional general equipment in the technical field, and can be purchased from the market:
FIG. 1 and FIG. 2 are schematic diagrams of the structure of the middle device of the present invention
FIG. 3 is a flow chart of the middle part of the process of the present invention
Wherein, the marks in the figure are specifically: 1. cold drier, 2 filter, 3 membrane separator (3-1 permeation side, 3-2 permeation side), 4 pressure regulating valve, 5 vacuum pump, 6 hydrogen-rich compressor, 7 reflux pipeline, 8 desorption gas compressor, 9 pressure-swing adsorption hydrogen-purifying device, 10 heater
Detailed Description
Example 1
A device for purifying and recovering hydrogen from hydrogen-containing fuel gas is provided with a freeze drying machine, a filter, a gas decomposition compressor, a membrane separator, a vacuum pump, a pressure regulating valve, a hydrogen-rich gas compressor, a backflow pipeline and a pressure swing adsorption hydrogen purification device, wherein the freeze drying machine is connected with the filter, the filter is connected with the membrane separator, the membrane separator is connected with the vacuum pump, the vacuum pump is connected with the hydrogen-rich gas compressor, one end of the pressure regulating valve is arranged between the membrane separator and the vacuum pump, the other end of the pressure regulating valve is arranged between the vacuum pump and the hydrogen-rich gas compressor, and the membrane separator, the vacuum pump and the; the hydrogen-rich gas compressor is connected with the pressure swing adsorption hydrogen purification device, the pressure swing adsorption hydrogen purification device is connected with the gas decomposition compressor, and the other end of the gas decomposition compressor is connected with the cold dryer; the hydrogen product is output by a pressure swing adsorption hydrogen purification device, and the residual fuel gas is output by a membrane separator; all structures are connected by pipelines.
The membrane separator is provided with a membrane assembly comprising a membrane, the membrane is provided with a retentate side and a permeate side, and the permeate side is connected with a vacuum pump and permeates hydrogen; one end of the surplus side is connected with the filter, and the other end is connected with the fuel gas device, so that the surplus fuel gas is output. The raw material inlet and outlet are connected to form the retentate side, and the permeate side is the other side through which hydrogen gas permeates. The connection point for the vacuum pump is on the permeate side of the hydrogen-rich gas.
The pressure at the retentate side is 0.5MPa, and the pressure at the permeate side is negative pressure, which is-0.06 MPa.
The membrane separator is provided with a membrane assembly which is cylindrical, and a separation membrane which is a hollow fiber membrane is arranged in the membrane assembly. The hollow fiber membrane is fibrous in shape and has a self-supporting function, and is prepared by processing polysulfone and dimethylacetamide into fiber filaments with a hollow inner cavity, and coating the fiber filaments with a high-permeability polymer, so that the hollow fiber membrane has a selective permeability characteristic. Since water vapor, hydrogen, ammonia, and carbon dioxide permeate faster, and methane, nitrogen, argon, oxygen, and carbon monoxide permeate slower, this allows for a fast permeation to slow permeation separation. Is distinguished from the fact that polymeric membranes are more permeable to non-condensable gases of relatively small molecular mass, such as hydrogen.
The hydrogen is selectively permeated by the difference between the gas pressure at both sides and the difference between the permeation rates of the fuel gas and the hydrogen in the mixed gas, thereby achieving the separation effect. Hydrogen was delivered by a vacuum pump. The hydrogen is selectively separated from the fuel gas, resulting in improved hydrogen recovery.
Example 2
A device for purifying and recovering hydrogen from hydrogen-containing fuel gas is provided with a freeze drying machine, a filter, a heater, a gas decomposition compressor, a membrane separator, a vacuum pump, a pressure regulating valve, a hydrogen-rich gas compressor, a backflow pipeline and a pressure swing adsorption hydrogen purification device, wherein the freeze drying machine is connected with the filter, the filter is connected with the membrane separator, one end of the heater is connected with the filter, the other end of the heater is connected with the freeze drying machine, the membrane separator is connected with the vacuum pump, the vacuum pump is connected with the hydrogen-rich gas compressor, one end of the pressure regulating valve is arranged between the membrane separator and the vacuum pump, the other end of the pressure regulating valve is arranged between the vacuum pump and the hydrogen-rich; the hydrogen-rich gas compressor is connected with the pressure swing adsorption hydrogen purification device, the pressure swing adsorption hydrogen purification device is connected with the gas decomposition compressor, and the other end of the gas decomposition compressor is connected with the cold dryer; the hydrogen product is output by a pressure swing adsorption hydrogen purification device, and the residual fuel gas is output by a membrane separator; all structures are connected by pipelines.
The membrane separator is provided with a membrane assembly comprising a membrane, the membrane is provided with a retentate side and a permeate side, and the permeate side is connected with a vacuum pump and permeates hydrogen; one end of the surplus side is connected with the filter, and the other end is connected with the fuel gas device, so that the surplus fuel gas is output. The raw material inlet and outlet are connected to form the retentate side, and the permeate side is the other side through which hydrogen gas permeates. The connection point for the vacuum pump is on the permeate side of the hydrogen-rich gas.
The pressure at the retentate side is 0.2 or 1.0Mpa, and the pressure at the permeate side is negative pressure, which is-0.04 or-0.09 Mpa.
Example 3
A device for purifying and recovering hydrogen from hydrogen-containing fuel gas is provided with a freeze drying machine, a filter, a heater, a gas decomposition compressor, a membrane separator, a vacuum pump, a pressure regulating valve, a hydrogen-rich gas compressor, a backflow pipeline and a pressure swing adsorption hydrogen purification device, wherein the freeze drying machine is connected with the filter, the filter is connected with the membrane separator, one end of the heater is connected with the membrane separator, the other end of the heater is connected with the freeze drying machine, the membrane separator is connected with the vacuum pump, the vacuum pump is connected with the hydrogen-rich gas compressor, one end of the pressure regulating valve is arranged between the membrane separator and the vacuum pump, the other end of the pressure regulating valve is arranged between the vacuum pump and the hydrogen-rich; the hydrogen-rich gas compressor is connected with the pressure swing adsorption hydrogen purification device, the pressure swing adsorption hydrogen purification device is connected with the gas decomposition compressor, and the other end of the gas decomposition compressor is connected with the cold dryer; the hydrogen product is output by a pressure swing adsorption hydrogen purification device, and the residual fuel gas is output by a membrane separator; all structures are connected by pipelines.
The membrane separator is provided with a membrane assembly comprising a membrane, the membrane is provided with a retentate side and a permeate side, and the permeate side is connected with a vacuum pump and permeates hydrogen; one end of the surplus side is connected with the filter, and the other end is connected with the fuel gas device, so that the surplus fuel gas is output. The raw material inlet and outlet are connected to form the retentate side, and the permeate side is the other side through which hydrogen gas permeates. The connection point for the vacuum pump is on the permeate side of the hydrogen-rich gas. The pressure of the retentate side is 0.8Mpa, the pressure of the permeate side is negative pressure, and the pressure is-0.081 Mpa, or-0.085 Mpa, or-0.083 Mpa.
The utility model discloses in, utilize the device to carry out the method of purification recovery hydrogen from hydrogen-containing fuel gas, including following step:
(1) hydrogen-containing fuel gas enters a cold dryer to remove hydrocarbon components, water and other liquid substances; the cold drying temperature is 2-10 ℃, the pressure of the hydrogen-containing fuel gas is 0.2-1.0 Mpa, and the hydrogen content is 20-40 percent.
(2) Heating in a heater, wherein the temperature of the heated gas is 20 ℃ or 80 ℃ or 60 ℃, and the hydrogen-containing fuel gas of the oil refinery is heated before entering a filtering and membrane separation device.
(3) Removing trace solid particle impurities in the gas through a filter;
(4) purifying hydrogen in a membrane separator, a vacuum pump, a reflux pipeline and a pressure regulating valve, evacuating hydrogen at the permeation side of the membrane to obtain a crude hydrogen product, and discharging gas at the residual side of the membrane out of the membrane separator to be output as residual fuel gas;
the pressure of the permeation side of the membrane in the membrane separator is reduced and stabilized to a lower pressure, and the residual fuel gas enters a factory fuel gas pipe network to be used as fuel;
(5) the crude hydrogen product in the step (3) enters a hydrogen-rich compressor and a pressure swing adsorption hydrogen purification device for purification again; outputting a part of gas as a hydrogen product; and the hydrogen product obtained by the evacuation system is pressurized and then is further purified by a pressure swing adsorption hydrogen purification device to obtain pure hydrogen or a high-purity hydrogen product.
(6) And (4) passing the other part of the gas in the step (4) through a desorption gas compressor, mixing with the hydrogen-containing fuel gas, and recycling.
When the permeation side of the membrane separation device is evacuated by adopting an evacuation system, hydrogen at the outlet of a partial vacuum system is returned to the permeation side of the membrane device so as to ensure the stable pressure of the permeation side.
Test No.)
Composition of raw material gas
| Composition of | H2 | CH4 | C2H6 | C3H8 | C4 | C5+ |
| V％ | 50 | 17 | 12.5 | 9.5 | 4 | 2 |
The refinery reforming pressure swing adsorption purification hydrogenolysis gas with the composition content as shown in the table enters a cold drying machine under the conditions of 0.5MPa and 40 ℃ to remove liquid substances such as hydrocarbon components, water and the like, enters a filter to remove trace solid particle impurities in the gas, enters a small circulation structure consisting of a membrane separator, a vacuum pump, a backflow pipeline and a pressure regulating valve to purify hydrogen, the vacuum pump, the backflow pipeline and the pressure regulating valve which are connected with the permeation side of a membrane reduce the pressure of the permeation side to-0.085 Mpa, hydrogen-rich permeation gas is pumped out by the vacuum pump (except for a part of pressure returned to a membrane unit to stabilize the pressure) to obtain hydrogen-rich gas (crude hydrogen product), the hydrogen-rich gas is pressurized to 2.6Mpa by a compressor and enters a pressure swing adsorption hydrogen purification device to obtain high-purity hydrogen with the purity of 99.999 percent, hydrogen-containing desorption gas of the pressure swing adsorption hydrogen purification device is pressurized to 0.55MPa by the compressor, the residual gas which does not pass through the membrane is discharged into a factory fuel gas pipe network to be used as fuel gas, as shown in figure 1.
The cold drying temperature in the cold drying machine is 2-10 ℃, and the pressure value is 0.2-1.0 MPa.
The crude hydrogen product enters a hydrogen-rich compressor and a pressure swing adsorption hydrogen purification device for secondary purification; outputting a part of gas as a hydrogen product; and the hydrogen product obtained by the evacuation system is pressurized and then is further purified by a pressure swing adsorption hydrogen purification device to obtain pure hydrogen or a high-purity hydrogen product. Part of the gas is discharged from the pressure swing adsorption hydrogen purification device, passes through a desorption gas compressor, is mixed with the hydrogen-containing fuel gas, and is recycled.
In this example, the purity of hydrogen was 99.999% and the yield of hydrogen was 95%.
Test No. two
Composition of raw material gas
| Composition of | H2 | N2 | CH4 | C2H4 | C2H6 | C3H8 | C4 | C5+ |
| V％ | 26.3 | 14.2 | 27.3 | 15.6 | 12.7 | 0.82 | 0.6 | 2.48 |
The oil refinery catalytic cracking dry gas with the composition content as shown in the table is fed into a cold dryer to remove liquid substances such as hydrocarbon components, water and the like under the conditions of 0.7MPa and-40 ℃, the oil refinery catalytic cracking dry gas is fed into a filter to remove trace solid particle impurities in the oil refinery catalytic cracking dry gas, the oil refinery catalytic cracking dry gas is fed into a vacuum membrane separation device consisting of a membrane piece, a vacuum pump, a backflow pipeline and a pressure regulating valve to purify hydrogen, the vacuum pump, the backflow pipeline and the pressure regulating valve which are connected with the permeation side of a membrane reduce the pressure of the permeation side to-0.081 MPa, hydrogen-rich gas obtained by pumping out hydrogen-rich permeation gas (except for a part of pressure returned to a membrane unit to stabilize the pressure) through the vacuum pump is pressurized to 2.0MPa through a compressor and then fed into a pressure swing adsorption purification hydrogen device to obtain 99.9% of hydrogen product output device, and desorption gas discharge devices.
In this example, the purity of hydrogen was 99.9% and the yield of hydrogen was 82%.
Experiment three
Composition of raw material gas
| Composition of | H2 | C1 | C2 | C3 | C4 | C5 | C6 | C7 + |
| V％ | 25.7 | 12.13 | 52.1 | 0.77 | 1.91 | 2.62 | 1.80 | 2.97 |
The coking dry gas with the composition content as shown in the table is fed into a cold drying machine under the conditions of 0.3MPa and 30 ℃ to remove liquid substances such as hydrocarbon components, water and the like, the coking dry gas is fed into a filter to remove trace solid particle impurities in the coking dry gas, then the coking dry gas is fed into a vacuum membrane separation device consisting of a membrane piece, a vacuum pump, a backflow pipeline and a pressure regulating valve to concentrate hydrogen, the vacuum pump, the backflow pipeline and the pressure regulating valve which are connected with the permeation side of the membrane reduce the pressure of the permeation side to-0.09 MPa, the hydrogen-rich permeation gas is pumped out by the vacuum pump (except for a part of stable pressure returned to a membrane unit) to obtain hydrogen-rich gas, the hydrogen-rich gas is pressurized to 2.5MPa by a compressor and then fed into a pressure swing adsorption hydrogen purification device to obtain 99.9% hydrogen products, and desorbed gas.
In this example, the purity of hydrogen was 99.9% and the yield of hydrogen was 70%.
The utility model discloses in introduce vacuum membrane separator with pressure 0.2Mpa ~ 1.0 Mpa's the hydrogen-containing fuel gas of oil refinery, adopt the system of managing to find time to membrane separator's infiltration side to keep the infiltration side pressure to be the negative pressure, obtain crude hydrogen from the export of the system of managing to find time, the surplus gas that oozes behind the separation hydrogen is as fuel gas discharge membrane separator.
The utility model discloses well hydrogenous fuel gas gets into the cold machine desorption hydrocarbon component of doing, liquid material such as water, after the trace solid particle impurity in the filter desorption gas is passed through again, again through the membrane separator, the vacuum pump, backflow pipeline and pressure regulating valve separation hydrogen, the vacuum pump that the infiltration side of membrane is connected, backflow pipeline and pressure regulating valve reduce the infiltration side pressure and stabilize to lower pressure, because vacuum system has reduced the pressure of infiltration side, the partial pressure difference of the membrane both sides as hydrogen infiltration driving force has obviously been improved, the permeation efficiency of hydrogen among the membrane device has been improved, with not managing to find time the current membrane separation recovery hydrogen device of step-down in the infiltration side relatively, can reduce the quantity reduce cost of membrane, increase the output of hydrogen and improve economic benefits.
The hydrogen-rich gas at the permeation side is obtained by a pumping-out system, the hydrogen-rich gas is pressurized by a compressor and then enters a pressure swing adsorption device for further purification to obtain 99.9-99.999% pure hydrogen or high-purity hydrogen products, and the gas at the permeation side enters a factory fuel gas pipe network for use as fuel; part of the gas passes through a desorption gas compressor and then is mixed with hydrogen-containing fuel gas, and the mixture enters a cold dryer together for next hydrogen separation and recovery. The whole structure forms a circulating recovery separation system, the structural design is simple, the recovery separation effect is good, and the cost is low.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, and the above embodiments and description have been described only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention, which will also have various changes and modifications, all of which will fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a device of purification recovery hydrogen in hydrogen-containing fuel gas which characterized in that: the device comprises a refrigeration dryer, a filter, a gas decomposition compressor, a membrane separator, a vacuum pump, a pressure regulating valve, a hydrogen-rich gas compressor, a backflow pipeline and a pressure swing adsorption hydrogen purification device, wherein the refrigeration dryer is connected with the filter; the hydrogen-rich gas compressor is connected with the pressure swing adsorption hydrogen purification device, the pressure swing adsorption hydrogen purification device is connected with the desorption gas compressor, and the other end of the desorption gas compressor is connected with the cold dryer; the hydrogen product is output by the pressure swing adsorption hydrogen purification device, and the residual fuel gas is output by the membrane separator.
2. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 1, wherein: the membrane separator is provided with a membrane assembly comprising a membrane, the membrane is provided with a retentate side and a permeate side, and the permeate side is connected with a vacuum pump and permeates hydrogen; one end of the residual side is connected with the filter, and the other end is connected with the fuel gas device to output residual fuel gas.
3. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 2, wherein: the pressure of the residual side is 0.2-1.0 Mpa.
4. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 2, wherein: the pressure of the infiltration side is negative pressure and is-0.04 to-0.09 Mpa.
5. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 4, wherein: the pressure of the infiltration side is-0.081 to-0.085 Mpa.
6. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 1, wherein: and a heater is arranged between the filter and the cold drying machine, one end of the heater is connected with the filter, and the other end of the heater is connected with the cold drying machine.
7. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 6, wherein: the temperature of the heater is 20-80 ℃.
8. The apparatus for purifying and recovering hydrogen from hydrogen-containing fuel gas according to claim 1, wherein: the drying temperature of the drying machine is 2-10 ℃, and the pressure value is 0.2-1.0 Mpa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111232924A (en) * | 2019-12-25 | 2020-06-05 | 昊华化工科技集团股份有限公司 | Device and method for purifying and recovering hydrogen from hydrogen-containing fuel gas and application |
| CN113247861A (en) * | 2021-05-17 | 2021-08-13 | 广东赛瑞新能源有限公司 | Hydrogen recovery system using gas as raw material gas and recovery method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111232924A (en) * | 2019-12-25 | 2020-06-05 | 昊华化工科技集团股份有限公司 | Device and method for purifying and recovering hydrogen from hydrogen-containing fuel gas and application |
| CN113247861A (en) * | 2021-05-17 | 2021-08-13 | 广东赛瑞新能源有限公司 | Hydrogen recovery system using gas as raw material gas and recovery method and application thereof |
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